Commutator cylinder



' "C. W, STARKER.

V COMMUTATOR CYLINDER; APPLICATION FILED JAN. 14, I 9I8.

1,428,865,. v PatentedSept.12,1922.

II III! ////I/// I WITNESSES: INVENTOR BY f I I 1, v ATTORNEY PatentedSept. 12, 1922.

UNITED STATES PATENT/OFFICE.

CHARLES w. STARKER, .OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR 'ro WESTING-I-IOUSE ELECTRIC AND MANUFACTURING COMPANY, A' CORPORATIONOF PENN-SYLVA'NIA.

Application filed 1 mm 14, 1918. Serial No. 211,771.

To all whom it may concern: v y

Be it known that I, CHARLES W. STARKER, a citizen of the German Empire,and a resident of Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in commutator.Cylinders, of which the following is a specification. v My inventionrelates to dynamo-electric 10 machinesand has special relation tocommutator cylinders therefor. y y

The object of my invention is to rovide a commutator cylinder by meansof? which points of e ual potential throughout .the armature $11211 beconnected together and which the leads connecting these points shall befirmly supported in easily accessible positions. y I i Heretofore, ithas been customary to connect points of equal potential in an armatureby means of cross connectors situated either at the end'ofthe commutatoradjacent the armature or at the end of the armature opposite the.commutator cylinder for the purpose of equalizing the current flow indifferent portions of the armature winding, thus compensating. for the'current-un balancing effect of eccentric armature mount ing anddifi'erences'inthe permeability of different pole-pieces and ofdifferent por tionsof the frame. When the cross connections are situatedat the end of the commutator cylinder adjacent the armature, they areinaccessible for inspection and repair and when they are situated at theend of the armature opposite the commutator cylinder, they areinaccessible for inspection or repair and have the additionaldisadvantage that different potentials may be developed in the leadswhich connect the crossconnectors to the commutator bars, resulting indiiferent values of current flowing in parts of the armature in whichthe current values should be the same, the elimina 46 tion of which isthe prime object of the cross-connections. 1

By my invention, I have provided a means whereby the cross-connectorsare supported at the end of the commutator cylinder op- 50 posite thearmature, rendering them readily accessible, and are connected directlyto the commutator bars, thereby eliminating any coMMUrA'roEi cYL IivnEE.

possibility of a difierence barsthus connected. I

In the accompanying drawing, Fig. 1 is a s de elevational [view of aportion of, a dynamo-electric machine, constructed in accordance with myinvention, partsbeing broken away to illustrate the cross conne v tions;and Fig. 2 isasectionalview of the of potential atthe machine portionshown in Fig' "1, thefsec-' tion being taken along the -line\-IIIIthereof. I Referring more particularly tothe draw ings, have shown aplurality jofconductmg 'bars 1 and insulating bars'or strips 2alternately disposed to form a commutator cylinder that is supportedby,but insulated from, a sleeve 3 situatedon the inside thereof. Bars 4equally spaced aboutthe 'periphery of the commutator-cylinder projectfrom the end thereof forming the end portions 5 to whichcross-connectors 6 are'attached. The end portions 5 are held rigidly inposition by means of spacing blocks. 7 formed of wood or some othersuitable in. sulating material. extends beyond the main body of the[commutator cylinder and provides a supporting means forthe fendportions'5 of the commutator bars 4, the cross-connectors 6 and thespacing blocks 7 which are heldthereagainst by means of banding wire 8which is also insulated therefrom.

While I have described a commutator having equi-spaced bars projectingfrom the end of the commutator cylinder, it is obvious that irregularlyspaced bars connected to points in the armature symmetrically dis posedelectrically-may be connected together in the same manner to accomplishthe same purpose.

From the foregoing description of what is shown in the drawing, it willbe readily apparent that the cross connectors are readily accessible forrepair and are provided with a firm and rigid support.

While I have shown and described my invention in its preferred form, itwill be obvious to those skilled in the art that it is not so limitedbut is susceptible of various minor changes and modifications withoutdeparting from the spirit thereof, and I desire, therefore, that onlysuch limitations The supporting sleeve 3 I shall be placed thereupon asare imposed by the prior art or are set forth in the appended claims.

I claim as my invention:

1. In a dynamo-electric machine, con ducting bars and alternatelydisposed nonconducting bars constituting a hollow commutator cylinder,and a supporting sleeve located within said cylinder, a plurality ofsaid conducting bars being uniformly spaced and projectin from one endof said cylinder, and cone uctors mounted on said supporting sleeve andconnecting the ends of equi-potential projecting bars, said conductingbars and said conductors being disposed at the same distance from thecenter.

2. In a dynamo-electric machine, con ducting bars and alternatelydisposed nonconducting bars constituting a hollow conimutator cylinder,a supporting sleeve located .within said cylinder, a plurality of saidconducting bars being uniformly spaced and projecting from one end ofsaid cylinder, spacing blocks of insulating material located betweensaid projecting bar ends and conductors connecting projecting bar endsof equal potential, said conductors and said spacing blocks beingmounted on, but insulated from, said supporting sleeve, and bandingmaterial surrounding said projecting ends and said end-connectingconductors.

3. In a dynamo-electric machine, c0nd'uctingbars and alternatelydisposed nonconducting bars constituting a hollow conimutator cylinder,a sleeve provided with a flange at its outer end disposed within saidcylinder, a: plurality of said conductor bars being uniformly spaced andprojecting from one end of said cylinder, insulating blocks dis osedbetween said projecting portions, an conductors disposed adjacent theends of said bars and connecting certain of them, the projectingportions of said conductors and the said connectors being supported uponbut insulated from said sleeve and supported between said insulatingblocks and the flange on said sleeve.

4. In a dynamo-electric machine, conducting bars and alternatelydisposed nonconducting bars constituting a hollow commutator cylinder, asleeve provided. ,with a flange at its outer end disposed within saidcylinder, a plurality of said conductor bars being uniformly spaced andprojecting from one end of said cylinder, insulating blocks disposedbetween said projecting portions, and conductors disposed adjacent theends of said bars and connecting certain of them, the projectingportions of said conductors and the said connectors being supported uponsaid sleeve and supported between said blocks and the flange on saidsleeve, and a continuous layer of insulation material disposedintermediate said projecting bars and said sleeve, said connectors andsaid. sleeve, said connectors and said flange, and on the outerperiphery of the cylinder formed by said connectors and said projectingbars.

5. In a dynamo-electric machine, a commutator cylinder comprising aplurality of alternately disposed conducting and insulating segments anda V-ring disposed within said cylinder, a plurality of said conductingsegments being uniformly spaced and projecting from one end of saidcylinder, conductors mounted adjacent said projecting ends andconnecting together certain of them, said conducting segments and saidconductors being disposed at the same distance from the center, and asleeve integral withsaid V-ring disposed within said projecting segmentends and said conductors and supporting the same.

In testimony whereof, I have hereunto subscribed .my name this 29th dayof Dec.

CHARLES W. STARKER.

